In the winter of 1841-1842, George S. Simpson and Robert Fisher founded a settlement called El Pueblo at the site of what would later become
Pueblo, Colorado. Brown helped build the trading post which was near the union of
Fountain Creek with the
Arkansas River. Several independent traders, formerly
mountain men, their wives, children, and employees lived at the trading post. The traders were
Anglos; their wives or consorts were Hispanics or
American Indians. One of the mountain men at the Pueblo was
Jim Beckwourth who in 1843 left his wife (likely an informal union) Maria Luisa Sandoval (born about 1825), and daughter Matilda in Pueblo while he journeyed to California. When he returned in 1846 Brown and Sandoval were living together. They would remain together for the rest of their lives. Brown may also have been involved with a woman named Nicolasa and to have killed a Frenchman (or American Indian, accounts differ) called "Seesome" in a duel about her. Nicolasa also inspired two additional duels. In 1845, Brown and his wife Luisa journeyed from Pueblo south to
Greenhorn Creek, a tributary of the Arkansas River, and established a
trading post for travelers where the
Trapper's Trail to
Taos, New Mexico, crossed Greenhorn Creek. In 1847, traveler
George Ruxton described Greenhorn as "one
adobe hovel of a more aspiring order" and two or three Indian lodges inhabited by French-Canadian trappers and their Indian wives. Ruxton described a "mountaineer" (probably Brown) he met there as an American who greeted him on horseback, "dressed in deer skin with long fringes on the arms and legs...with a rifle over the horn of his saddle." Brown sold whiskey, grew corn, raised cattle, and engaged Mexican workers to build a
grist mill. He spent a good part of his time traveling in search of merchandise and customers, extending his trade as far as
Fort Laramie in
Wyoming. Luisa managed the trading post while he was away. ==California==